Decryptors can report kNoKey to WebMediaPlayer

media/filters/decrypting_video_decoder.cc

Index: media/filters/decrypting_video_decoder.cc
diff --git a/media/filters/decrypting_video_decoder.cc b/media/filters/decrypting_video_decoder.cc
index f4aa3756ed8b1c1a0ef1e5092091788c2370d772..68fadd125badc174d8e480006bd0df00644dd6a7 100644
--- a/media/filters/decrypting_video_decoder.cc
+++ b/media/filters/decrypting_video_decoder.cc
@@ -36,10 +36,12 @@ std::string DecryptingVideoDecoder::GetDisplayName() const {
   return kDecoderName;
 }
 
-void DecryptingVideoDecoder::Initialize(const VideoDecoderConfig& config,
-                                        bool /* low_delay */,
-                                        const PipelineStatusCB& status_cb,
-                                        const OutputCB& output_cb) {
+void DecryptingVideoDecoder::Initialize(
+    const VideoDecoderConfig& config,
+    bool /* low_delay */,
+    const PipelineStatusCB& status_cb,
+    const OutputCB& output_cb,
+    const base::Closure& waiting_for_encryption_key_cb) {
   DVLOG(2) << "Initialize()";
   DCHECK(task_runner_->BelongsToCurrentThread());
   DCHECK(state_ == kUninitialized ||
@@ -52,6 +54,7 @@ void DecryptingVideoDecoder::Initialize(const VideoDecoderConfig& config,
 
   init_cb_ = BindToCurrentLoop(status_cb);
   output_cb_ = BindToCurrentLoop(output_cb);
+  waiting_for_encryption_key_cb_ = waiting_for_encryption_key_cb;
   weak_this_ = weak_factory_.GetWeakPtr();
   config_ = config;
 
@@ -270,6 +273,7 @@ void DecryptingVideoDecoder::DeliverFrame(
     }
 
     state_ = kWaitingForKey;
+    waiting_for_encryption_key_cb_.Run();
     return;
   }